I would like to see an image on top of Camera SurfaceView\preview. How do I do that? Any examples?
A great example can be found in ZXing library, Barcode Scanner application.
What they do is they use FrameLayout
for SurfaceView
and their custom ViewfinderView
so that both SurfaceView
and ViewfinderView
are covering full screen:
<FrameLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="fill_parent"
android:layout_height="fill_parent">
<SurfaceView android:id="@+id/preview_view"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
android:layout_centerInParent="true"/>
<com.google.zxing.client.android.ViewfinderView
android:id="@+id/viewfinder_view"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
android:background="@color/transparent"/>
</FrameLayout>
Note the fill_parent
values in layout_height
and layout_width
for both views.
And then they draw custom things in ViewfinderView.onDraw()
method, just on top of what is being displayed by camera preview.
If you don't want to draw anything, but just use predefined image, then use ImageView
instead of ViewfinderView
. You might consider calling setAlpha
method to make your image transparent (if drawable wasn't already transparent by itself).
Here is a screenshot from Barcode Scanner:
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